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X11R7.4 - man page for xvisualinfo (x11r4 section 3)

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XGetVisualInfo(3)			  XLIB FUNCTIONS			XGetVisualInfo(3)

NAME
       XGetVisualInfo, XMatchVisualInfo, XVisualIDFromVisual, XVisualInfo - obtain visual infor-
       mation and visual structure

SYNTAX
       XVisualInfo *XGetVisualInfo(Display *display, long vinfo_mask, XVisualInfo *vinfo_tem-
	      plate, int *nitems_return);

       Status XMatchVisualInfo(Display *display, int screen, int depth, int class, XVisualInfo
	      *vinfo_return);

       VisualID XVisualIDFromVisual(Visual *visual);

ARGUMENTS
       class	 Specifies the class of the screen.

       depth	 Specifies the depth of the screen.

       display	 Specifies the connection to the X server.

       nitems_return
		 Returns the number of matching visual structures.

       screen	 Specifies the screen.

       visual	 Specifies the visual type.

       vinfo_mask
		 Specifies the visual mask value.

       vinfo_return
		 Returns the matched visual information.

       vinfo_template
		 Specifies the visual attributes that are to be used in matching the visual
		 structures.

DESCRIPTION
       The XGetVisualInfo function returns a list of visual structures that have attributes equal
       to the attributes specified by vinfo_template.  If no visual structures match the template
       using the specified vinfo_mask, XGetVisualInfo returns a NULL.  To free the data returned
       by this function, use XFree.

       The XMatchVisualInfo function returns the visual information for a visual that matches the
       specified depth and class for a screen.	Because multiple visuals that match the specified
       depth and class can exist, the exact visual chosen is undefined.  If a visual is found,
       XMatchVisualInfo returns nonzero and the information on the visual to vinfo_return.  Oth-
       erwise, when a visual is not found, XMatchVisualInfo returns zero.

       The XVisualIDFromVisual function returns the visual ID for the specified visual type.

STRUCTURES
       The XVisualInfo structure contains:

       /* Visual information mask bits */

       #define	 VisualNoMask		     0x0
       #define	 VisualIDMask		     0x1
       #define	 VisualScreenMask	     0x2
       #define	 VisualDepthMask	     0x4
       #define	 VisualClassMask	     0x8

       #define	 VisualRedMaskMask	     0x10
       #define	 VisualGreenMaskMask	     0x20
       #define	 VisualBlueMaskMask	     0x40
       #define	 VisualColormapSizeMask      0x80
       #define	 VisualBitsPerRGBMask	     0x100
       #define	 VisualAllMask		     0x1FF
       /* Values */

       typedef struct {
	    Visual *visual;
	    VisualID visualid;
	    int screen;
	    int depth;
	    int class;
	    unsigned long red_mask;
	    unsigned long green_mask;
	    unsigned long blue_mask;
	    int colormap_size;
	    int bits_per_rgb;
       } XVisualInfo;

SEE ALSO
       XFree(3X11)
       Xlib - C Language X Interface

X Version 11				   libX11 1.2.1 			XGetVisualInfo(3)
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